Easing question

Yes you can. Have you tried it?
your results might look like this:
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The closer keyframes are together in playing time the faster the movement. By having keyframes spread apart in timing it's naturally a slower movement.

http://www.youtube.com/watch?v=mP36cNkQNo0
same rules apply for motion. In Motion we just have a lot more control and ways to do it. The best place for anyone to start imho is with the manual in hand; dive in.

In the motion path behavior there is a "Speed" parameter. Set that to custom. Then set keyframes in the custom speed window right below (numerical value, 0-100 refers to percentage of path completed). You can the go into the keyframe editor and move the key frames to the points in the timeline you want to get your effect (If you place, say the keyframe at 25% and move that to the near the end of the behavior, traveling the first 25% of the path will take up most of the behavior, the last 75% of the path will zoom by.) You can change the keyframe interpolation to smooth out transitions between speed changes. That's at least one way.